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Check: RHEL-09-231100

RHEL 9 STIG: RHEL-09-231100 (in versions v2 r3 through v2 r2)

Title

RHEL 9 must prevent files with the setuid and setgid bit set from being executed on the /boot directory. (Cat II impact)

Discussion

The "nosuid" mount option causes the system not to execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access. Satisfies: SRG-OS-000368-GPOS-00154, SRG-OS-000480-GPOS-00227

Check Content

Verify the /boot directory is mounted with the "nosuid" option with the following command: $ mount | grep '\s/boot\s' /dev/sda1 on /boot type xfs (rw,nosuid,relatime,seclabe,attr2,inode64,noquota) If the /boot file system does not have the "nosuid" option set, this is a finding.

Fix Text

Modify "/etc/fstab" to use the "nosuid" option on the "/boot" directory.

Additional Identifiers

Rule ID: SV-257861r1044941_rule

Vulnerability ID: V-257861

Group Title: SRG-OS-000368-GPOS-00154

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CCIs

CCIs tied to check.

Number	Definition
CCI-001764	Prevent program execution in accordance with organization-defined policies, rules of behavior, and/or access agreements regarding software program usage and restrictions; rules authorizing the terms and conditions of software program usage.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-7(2)	Prevent Program Execution